test: fixed test
Forms: partial rendering moved to RadioList::getControlPart() and getLabelPart()
Forms: added support for partial rendering to CheckboxList
Forms: Checkbox::getLabel() returns NULL and getControl() returns <label><input> pair (BC break)

Checkbox was changed to be inconsistent with all others controls. For compatibility, add semicolon to Latte macros, i.e. {label checkbox:} and {input checkbox:}